US20170004797A1 - Data driver, display apparatus having the same and method of driving the display apparatus - Google Patents
Data driver, display apparatus having the same and method of driving the display apparatus Download PDFInfo
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- US20170004797A1 US20170004797A1 US15/145,172 US201615145172A US2017004797A1 US 20170004797 A1 US20170004797 A1 US 20170004797A1 US 201615145172 A US201615145172 A US 201615145172A US 2017004797 A1 US2017004797 A1 US 2017004797A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Definitions
- Exemplary embodiments of the present inventive concept relate to a data driver, and more particularly to a display apparatus including the data driver and a method of driving the display apparatus.
- a liquid crystal display (LCD) apparatus may include a first substrate including a pixel electrode, a second substrate including a common electrode, and a liquid crystal layer disposed between the first and second substrates. Voltages may be applied to the pixel electrode and the common electrode to generate an electric field. Transmittance of light passing through the liquid crystal layer may be controlled according to the electric field, and thus, a desired image may be displayed.
- LCD liquid crystal display
- the LCD apparatus may be prone to side visibility deterioration as compared to front visibility presentation.
- Exemplary embodiments of the present inventive concept may provide a data driver having increased display quality.
- Exemplary embodiments of the present inventive concept may provide a display apparatus including the data driver.
- Exemplary embodiments of the present inventive concept may provide a method of driving the display apparatus.
- a data driver includes a first data voltage generator, a data converter and a second data voltage generator.
- the first data voltage generator is configured to generate a first data voltage based on first pixel data and configured to output the first data voltage to a first data line, the first pixel data being generated based on a first gamma curve.
- the data converter is configured to convert second pixel data to first converted pixel data, the second pixel data being generated based on the first gamma curve, the first converted pixel data being generated based on a second gamma curve different from the first gamma curve.
- the second data voltage generator is configured to generate a second data voltage based on the first converted pixel data and configured to output the second data voltage to a second data line.
- the data converter may access a look-up table configured to convert the second pixel data corresponding to a first gray to the first converted pixel data corresponding to the first gray.
- the first pixel data may be substantially the same as the second pixel data.
- a polarity of the first data voltage may be different from a polarity of the second data voltage.
- the first data line may be adjacent to the second data line.
- a composite gamma curve of the first and second gamma curves may be substantially the same as a reference gamma curve.
- a luminance of an image based on the first gamma curve may be equal to or higher than a luminance of an image based on the reference gamma curve, and a luminance of an image based on the second gamma curve may be equal to or lower than the luminance of the image based on the reference gamma curve.
- a display apparatus includes a display panel, a timing controller and a data driver.
- the display panel includes a first gate line extending in a first direction, first and second data lines extending in a second direction, and a first pixel connected to the first gate line and the first and second data lines, the second direction crossing the first direction.
- the timing controller is configured to generate first and second pixel data based on input image data and a first gamma curve.
- the data driver is configured to generate a first data voltage based on the first pixel data to output the first data voltage to the first data line, configured to convert the second pixel data to first converted pixel data, and configured to generate a second data voltage based on the first converted pixel data to output the second data voltage to the second data line, the first converted pixel data being generated based on a second gamma curve different from the first gamma curve.
- the first pixel may include a first sub-pixel connected to the first gate line and the first data line and a second sub-pixel connected to the first gate line and the second data line.
- the first sub-pixel may be configured to display substantially the same color as the second sub-pixel.
- the data driver may access a look-up table configured to convert the second pixel data corresponding to a first gray to the first converted pixel data corresponding to the first gray.
- the first pixel data may be substantially the same as the second pixel data.
- a polarity of the first data voltage may be different from a polarity of the second data voltage.
- the first data line may be adjacent to the second data line.
- a composite gamma curve of the first and second gamma curves may be substantially the same as a reference gamma curve.
- a luminance of an image based on the first gamma curve may be equal to or higher than a luminance of an image based on the reference gamma curve, and a luminance of an image based on the second gamma curve may be equal to or lower than the luminance of the image based on the reference gamma curve.
- a method of driving a display apparatus includes generating first and second pixel data based on input image data and a first gamma curve.
- a first data voltage is generated based on the first pixel data to output the first data voltage to a first data line.
- the second pixel data is converted to first converted pixel data, the first converted pixel data being generated based on a second gamma curve different from the first gamma curve.
- a second data voltage is generated based on the first converted pixel data to output the second data voltage to a second data line.
- the display apparatus may include a display panel including a first gate line extending in a first direction, the first and second data lines extending in a second direction, and a first pixel connected to the first gate line and the first and second data lines, the second direction crossing the first direction.
- the first pixel may include a first sub-pixel connected to the first gate line and the first data line and a second sub-pixel connected to the first gate line and the second data line.
- converting the second pixel data to first converted pixel data may include converting the second pixel data corresponding to a first gray to the first converted pixel data corresponding to the first gray.
- the first pixel data may be substantially the same as the second pixel data.
- a composite gamma curve of the first and second gamma curves may be substantially the same as a reference gamma curve.
- a luminance of an image based on the first gamma curve may be equal to or higher than a luminance of an image based on the reference gamma curve, and a luminance of an image based on the second gamma curve may be equal to or lower than the luminance of the image based on the reference gamma curve.
- images may be generated based on a plurality of gamma curves without increasing a size of a timing controller or a data driver.
- FIG. 1 is a block diagram illustrating a display apparatus according to an exemplary embodiment of the present inventive concept
- FIG. 2 is a graph illustrating gamma curves used in a display apparatus according to an exemplary embodiment of the present inventive concept
- FIG. 3 is a diagram illustrating a display panel included in a display apparatus according to an exemplary embodiment of the present inventive concept
- FIG. 4 is a block diagram illustrating a data driver included in a display apparatus according to an exemplary embodiment of the present inventive concept.
- FIG. 5 is a table illustrating a look-up table stored in a data driver included in a display apparatus according to an exemplary embodiment of the present inventive concept.
- FIG. 1 is a block diagram illustrating a display apparatus according to an exemplary embodiment of the present inventive concept.
- a display apparatus may include a display panel 100 and a panel driver.
- the panel driver may include a timing controller 200 , a gate driver 300 , a gamma reference voltage generator 400 and a data driver 500 .
- the display panel 100 may include a display region displaying an image and a peripheral region adjacent to the display region.
- the display panel 100 may include a plurality of gate lines, a plurality of data lines and a plurality of pixels connected to the gate lines and the data lines.
- the gate lines may extend in a first direction D 1 and the data lines may extend in a second direction D 2 crossing the first direction D 1 .
- the pixels may include a switching element, a liquid crystal capacitor and a storage capacitor.
- the liquid crystal capacitor and the storage capacitor may be electrically connected to the switching element.
- the pixels may be arranged in a matrix configuration.
- the display panel 100 will be described in more detail below with reference to FIG. 3 .
- the timing controller 200 may receive input image data RGB and an input control signal CONT from an external device.
- the input image data RGB may include red image data R, green image data G and blue image data B.
- the input control signal CONT may include a master clock signal and a data enable signal.
- the input control signal CONT may include a vertical synchronizing signal and a horizontal synchronizing signal.
- the timing controller 200 may generate a first control signal CONT 1 , a second control signal CONT 2 , a third control signal CONT 3 and a data signal DAT based on the input image data RGB and the input control signal CONT.
- the timing controller 200 may generate the first control signal CONT 1 controlling operations of the gate driver 300 based on the input control signal CONT, and may output the first control signal CONT 1 to the gate driver 300 .
- the first control signal CONT 1 may include a vertical start signal and a gate clock signal.
- the timing controller 200 may generate the second control signal CONT 2 controlling operations of the data driver 500 based on the input control signal CONT, and may output the second control signal CONT 2 to the data driver 500 .
- the second control signal CONT 2 may include a horizontal start signal and a load signal.
- the timing controller 200 may generate the data signal DAT based on the input image data RGB and a first gamma curve.
- the timing controller 200 may output the data signal DAT to the data driver 500 .
- the first gamma curve will be described in more detail below with reference to FIG. 2 .
- the timing controller 200 may generate the third control signal CONT 3 controlling operations of the gamma reference voltage generator 400 based on the input control signal CONT, and may output the third control signal CONT 3 to the gamma reference voltage generator 400 .
- the gate driver 300 may generate gate signals driving the gate lines in response to the first control signal CONT 1 received from the timing controller 200 .
- the gate driver 300 may sequentially output the gate signals to the gate lines.
- the gate driver 300 may be directly disposed on the display panel 100 , or may be connected to the display panel 100 in a tape carrier package (TCP) configuration. Alternatively, the gate driver 300 may be disposed on the peripheral region of the display panel 100 .
- TCP tape carrier package
- the gamma reference voltage generator 400 may generate a gamma reference voltage VGREF in response to the third control signal CONT 3 received from the timing controller 200 .
- the gamma reference voltage generator 400 may output the gamma reference voltage VGREF to the data driver 500 .
- the level of the gamma reference voltage VGREF may correspond to grayscales of a plurality of pixel data included in the data signal DAT.
- the gamma reference voltage generator 400 may be disposed in the timing controller 200 , or may be disposed in the data driver 500 .
- the data driver 500 may receive the second control signal CONT 2 and the data signal DAT from the timing controller 200 , and may receive the gamma reference voltage VGREF from the gamma reference voltage generator 400 .
- the data driver 500 may convert the data signal DAT to data voltages having analogue levels based on the gamma reference voltage VGREF.
- the data driver 500 may output the data voltages to the data lines.
- the data driver 500 may be directly disposed on the display panel 100 , or may be connected to the display panel 100 in a tape carrier package (TCP) configuration. Alternatively, the data driver 500 may be disposed on the peripheral region of the display panel 100 .
- TCP tape carrier package
- the data driver 500 will be described in more detail below with reference to FIG. 4 .
- FIG. 2 is a graph illustrating gamma curves used in a display apparatus according to an exemplary embodiment of the present inventive concept.
- gamma curves may indicate a relationship between a plurality of grayscales of an image and luminance or transmittance of the display panel 100 .
- a reference gamma curve GMR may increase a display quality of the display panel 100 .
- the reference gamma curve GMR may be a gamma curve with a gamma value of about 2.2.
- a luminance of an image based on a first gamma curve GM 1 may be equal to or higher than a luminance of an image based on the reference gamma curve GMR.
- a luminance of an image based on a second gamma curve GM 2 may be equal to or lower than the luminance of the image based on the reference gamma curve GMR.
- a composite gamma curve of the first gamma curve GM 1 and the second gamma curve GM 2 may be substantially the same as the reference gamma curve GMR.
- a pixel operating based on the reference gamma curve GMR may display an image having a luminance that is substantially the same as a target luminance.
- a pixel operating based on the first gamma curve GM 1 may display an image having a luminance that is higher than the target luminance.
- a pixel operating based on the second gamma curve GM 2 may display an image having a luminance that is lower than the target luminance.
- FIG. 3 is a diagram illustrating a display panel included in a display apparatus according to an exemplary embodiment of the present inventive concept.
- the display panel 100 may include first to third gate lines GL 1 , GL 2 , GL 3 extending in the first direction D 1 , first to sixth data lines DL 1 , DL 2 , DL 3 , DL 4 , DL 5 , DL 6 extending in the second direction D 2 crossing the first direction D 1 and first to third pixels P 1 , P 2 , P 3 .
- the first to third gate lines GL 1 ⁇ GL 3 may be sequentially arranged along the second direction D 2 .
- the first to sixth data lines DL 1 ⁇ DL 6 may be sequentially arranged along the first direction D 1 .
- the first pixel P 1 may include first and second sub-pixels SP 1 , SP 2 .
- the first sub-pixel SP 1 may be connected to the first gate line GL 1 and the first data line DLL
- the second sub-pixel SP 2 may be connected to the first gate line GL 1 and the second data line DL 2 .
- the first and second sub-pixels SP 1 , SP 2 may be adjacent to each other along the second direction D 2 .
- the first and second sub-pixels SP 1 , SP 2 may be adjacent to each other along the first direction D 1 .
- the first pixel P 1 may display a first color.
- the first color may be one of red, green and blue.
- the first pixel P 1 may display a first gray.
- the first sub-pixel SP 1 may display the first gray based on the first gamma curve GM 1 .
- the second sub-pixel SP 2 may display the first gray based on the second gamma curve GM 2 .
- the first pixel P 1 may display the first gray based on the reference gamma curve GMR.
- the second pixel P 2 may include third and fourth sub-pixels SP 3 , SP 4 .
- the third sub-pixel SP 3 may be connected to the first gate line GL 1 and the fourth data line DL 4 .
- the fourth sub-pixel SP 4 may be connected to the first gate line GL 1 and the third data line DL 3 .
- the third and fourth sub-pixels SP 3 , SP 4 may be adjacent to each other along the second direction D 2 .
- the third and fourth sub-pixels SP 3 , SP 4 may be adjacent to each other along the first direction D 1 .
- the second pixel P 2 may display a second color.
- the second color may be one of red, green and blue.
- the second pixel P 2 may display a second gray.
- the third sub-pixel SP 3 may display the second gray based on the first gamma curve GM 1 .
- the fourth sub-pixel SP 4 may display the second gray based on the second gamma curve GM 2 .
- the second pixel P 2 may display the second gray based on the reference gamma curve GMR.
- the third pixel P 3 may include fifth and sixth sub-pixels SP 5 , SP 6 .
- the fifth sub-pixel SP 5 may be connected to the first gate line GL 1 and the fifth data line DL 5 .
- the sixth sub-pixel SP 6 may be connected to the first gate line GL 1 and the sixth data line DL 6 .
- the fifth and sixth sub-pixels SP 5 , SP 6 may be adjacent to each other along the second direction D 2 .
- the fifth and sixth sub-pixels SP 5 , SP 6 may be adjacent to each other along the first direction D 1 .
- the third pixel P 3 may display a third color.
- the third color may be one of red, green and blue.
- the third pixel P 3 may display a third gray.
- the fifth sub-pixel SP 5 may display the third gray based on the first gamma curve GM 1 .
- the sixth sub-pixel SP 6 may display the third gray based on the second gamma curve GM 2 .
- the third pixel P 3 may display the third gray based on the reference gamma curve GMR.
- FIG. 4 is a block diagram illustrating a data driver included in a display apparatus according to an exemplary embodiment of the present inventive concept.
- FIG. 5 is a table illustrating a look-up table stored in a data driver included in a display apparatus according to an exemplary embodiment of the present inventive concept.
- the data driver 500 may include a first data voltage generator 510 , a data converter 520 and a second data voltage generator 530 .
- the data driver 500 may receive the data signal DAT from the timing controller 200 .
- the data signal DAT may include first pixel data PD 1 and second pixel data PD 2 .
- the first pixel data PD 1 and the second pixel data PD 2 may be data instructing the first pixel P 1 to display the first gray based on the first gamma curve GM 1 .
- the first pixel data PD 1 may be substantially the same as the second pixel data PD 2 .
- the first data voltage generator 510 may receive the first pixel data PD 1 .
- the first data voltage generator 510 may generate a first data voltage SDV 1 .
- the first data voltage SDV 1 may have an analogue level based on the first pixel data PD 1 .
- the first data voltage generator 510 may output the first data voltage SDV 1 to the first data line DL 1 .
- the data converter 520 may receive the second pixel data PD 2 .
- the data converter 520 may convert the second pixel data PD 2 to first converted pixel data CPD 1 .
- the first converted pixel data CPD 1 may be data instructing the first pixel P 1 to display the first gray based on the second gamma curve GM 2 .
- the data converter 520 may output the first converted pixel data CPD 1 to the second data voltage generator 530 .
- the data converter 520 may store a look-up table.
- the data converter 520 may convert the second pixel data PD 2 to the first converted pixel data CPD 1 by referring to the look-up table.
- the second pixel data PD 2 may have a value of 11111111 to display 255 gray based on the first gamma curve GM 1 .
- the first converted pixel data CPD 1 may have a value of 11111110 to display 255 gray based on the second gamma curve GM 2 .
- the data converter 520 may convert the value of 11111111 to the value of 11111110 by referring to the look-up table.
- the second pixel data PD 2 may have a value of 11111110 to display 254 gray based on the first gamma curve GM 1 .
- the first converted pixel data CPD 1 may have a value of 11111100 to display 254 gray based on the second gamma curve GM 2 .
- the data converter 520 may convert the value of 11111110 to the value of 11111100 by referring to the look-up table.
- the data converter 520 may include at least one nonvolatile memory such as an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory, a phase change random access memory (PRAM), a resistance random access memory (RRAM), a magnetic random access memory (MRAM), or a ferroelectric random access memory (FRAM).
- the look-up table may be stored in the nonvolatile memory.
- the look-up table may be stored in the nonvolatile memory when manufacturing the display apparatus.
- the data converter 520 may include at least one volatile memory such as a static random access memory (SRAM), or a dynamic random access memory (DRAM).
- the look-up table received from an external host or the timing controller, and may be stored in the volatile memory.
- the look-up table may be stored in the volatile memory at the beginning of an operation of the display apparatus.
- the second data voltage generator 530 may generate a second data voltage SDV 2 .
- the second data voltage SDV 2 may have an analogue level based on the first converted pixel data CPD 1 .
- the second data voltage generator 530 may output the second data voltage SDV 2 to the second data line DL 2 .
- a polarity of the first data voltage SDV 1 may be different from a polarity of the second data voltage SDV 2 .
- the polarity of the first data voltage SDV 1 may be positive with respect to a common voltage
- the polarity of the second data voltage SDV 2 may be negative with respect to the common voltage.
- the first data line DL 1 may be adjacent to the second data line DL 2 .
- the first pixel P 1 may be connected to two adjacent data lines DL 1 , DL 2 , and two sub-pixels SP 1 , SP 2 included in the first pixel P 1 may be connected to two data lines DL 1 , DL 2 , respectively.
- data voltages SDV 1 , SDV 2 may be output to two data lines DL 1 , DL 2 .
- data voltages may be output to 2*n data lines, where n is a natural number equal to or greater than 2.
- n data lines such as odd-numbered data lines
- the other n data lines such as even-numbered data lines
- the data converter may be shared by two data lines.
- the data driver may include a display apparatus and/or a system including the display apparatus, such as a mobile phone, a smart phone, a PDA, a PMP, a digital camera, a digital television, a set-top box, a music player, a portable game console, a navigation device, a personal computer (PC), a server computer, a workstation, a tablet computer, a laptop computer, a smart card, or a printer.
- a display apparatus such as a mobile phone, a smart phone, a PDA, a PMP, a digital camera, a digital television, a set-top box, a music player, a portable game console, a navigation device, a personal computer (PC), a server computer, a workstation, a tablet computer, a laptop computer, a smart card, or a printer.
- the display apparatus such as a mobile phone, a smart phone, a PDA, a PMP, a digital camera, a digital television, a set-top box,
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- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
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Abstract
Description
- This application claims priority under 35 U.S.C. §119 to Korean Patent Application No. 10-2015-0094216, filed on Jul. 1, 2015 in the Korean Intellectual Property Office (KIPO), the disclosure of which is incorporated by reference herein in its entirety.
- 1. Technical Field
- Exemplary embodiments of the present inventive concept relate to a data driver, and more particularly to a display apparatus including the data driver and a method of driving the display apparatus.
- 2. Discussion of Related Art
- A liquid crystal display (LCD) apparatus may include a first substrate including a pixel electrode, a second substrate including a common electrode, and a liquid crystal layer disposed between the first and second substrates. Voltages may be applied to the pixel electrode and the common electrode to generate an electric field. Transmittance of light passing through the liquid crystal layer may be controlled according to the electric field, and thus, a desired image may be displayed.
- The LCD apparatus may be prone to side visibility deterioration as compared to front visibility presentation.
- Exemplary embodiments of the present inventive concept may provide a data driver having increased display quality.
- Exemplary embodiments of the present inventive concept may provide a display apparatus including the data driver.
- Exemplary embodiments of the present inventive concept may provide a method of driving the display apparatus.
- A data driver according to an exemplary embodiment of the present inventive concept includes a first data voltage generator, a data converter and a second data voltage generator. The first data voltage generator is configured to generate a first data voltage based on first pixel data and configured to output the first data voltage to a first data line, the first pixel data being generated based on a first gamma curve. The data converter is configured to convert second pixel data to first converted pixel data, the second pixel data being generated based on the first gamma curve, the first converted pixel data being generated based on a second gamma curve different from the first gamma curve. The second data voltage generator is configured to generate a second data voltage based on the first converted pixel data and configured to output the second data voltage to a second data line.
- In an exemplary embodiment of the present inventive concept, the data converter may access a look-up table configured to convert the second pixel data corresponding to a first gray to the first converted pixel data corresponding to the first gray.
- In an exemplary embodiment of the present inventive concept, the first pixel data may be substantially the same as the second pixel data.
- In an exemplary embodiment of the present inventive concept, a polarity of the first data voltage may be different from a polarity of the second data voltage.
- In an exemplary embodiment of the present inventive concept, the first data line may be adjacent to the second data line.
- In an exemplary embodiment of the present inventive concept, a composite gamma curve of the first and second gamma curves may be substantially the same as a reference gamma curve. A luminance of an image based on the first gamma curve may be equal to or higher than a luminance of an image based on the reference gamma curve, and a luminance of an image based on the second gamma curve may be equal to or lower than the luminance of the image based on the reference gamma curve.
- A display apparatus according to an exemplary embodiment of the present inventive concept includes a display panel, a timing controller and a data driver. The display panel includes a first gate line extending in a first direction, first and second data lines extending in a second direction, and a first pixel connected to the first gate line and the first and second data lines, the second direction crossing the first direction. The timing controller is configured to generate first and second pixel data based on input image data and a first gamma curve. The data driver is configured to generate a first data voltage based on the first pixel data to output the first data voltage to the first data line, configured to convert the second pixel data to first converted pixel data, and configured to generate a second data voltage based on the first converted pixel data to output the second data voltage to the second data line, the first converted pixel data being generated based on a second gamma curve different from the first gamma curve.
- In an exemplary embodiment of the present inventive concept, the first pixel may include a first sub-pixel connected to the first gate line and the first data line and a second sub-pixel connected to the first gate line and the second data line.
- In an exemplary embodiment of the present inventive concept, the first sub-pixel may be configured to display substantially the same color as the second sub-pixel.
- In an exemplary embodiment of the present inventive concept, the data driver may access a look-up table configured to convert the second pixel data corresponding to a first gray to the first converted pixel data corresponding to the first gray.
- In an exemplary embodiment of the present inventive concept, the first pixel data may be substantially the same as the second pixel data.
- In an exemplary embodiment of the present inventive concept, a polarity of the first data voltage may be different from a polarity of the second data voltage.
- In an exemplary embodiment of the present inventive concept, the first data line may be adjacent to the second data line.
- In an exemplary embodiment of the present inventive concept, a composite gamma curve of the first and second gamma curves may be substantially the same as a reference gamma curve. A luminance of an image based on the first gamma curve may be equal to or higher than a luminance of an image based on the reference gamma curve, and a luminance of an image based on the second gamma curve may be equal to or lower than the luminance of the image based on the reference gamma curve.
- A method of driving a display apparatus according to an exemplary embodiment of the present inventive concept includes generating first and second pixel data based on input image data and a first gamma curve. A first data voltage is generated based on the first pixel data to output the first data voltage to a first data line. The second pixel data is converted to first converted pixel data, the first converted pixel data being generated based on a second gamma curve different from the first gamma curve. A second data voltage is generated based on the first converted pixel data to output the second data voltage to a second data line.
- In an exemplary embodiment of the present inventive concept, the display apparatus may include a display panel including a first gate line extending in a first direction, the first and second data lines extending in a second direction, and a first pixel connected to the first gate line and the first and second data lines, the second direction crossing the first direction.
- In an exemplary embodiment of the present inventive concept, the first pixel may include a first sub-pixel connected to the first gate line and the first data line and a second sub-pixel connected to the first gate line and the second data line.
- In an exemplary embodiment of the present inventive concept, converting the second pixel data to first converted pixel data may include converting the second pixel data corresponding to a first gray to the first converted pixel data corresponding to the first gray.
- In an exemplary embodiment of the present inventive concept, the first pixel data may be substantially the same as the second pixel data.
- In an exemplary embodiment of the present inventive concept, a composite gamma curve of the first and second gamma curves may be substantially the same as a reference gamma curve. A luminance of an image based on the first gamma curve may be equal to or higher than a luminance of an image based on the reference gamma curve, and a luminance of an image based on the second gamma curve may be equal to or lower than the luminance of the image based on the reference gamma curve.
- According to exemplary embodiments of the present inventive concept, images may be generated based on a plurality of gamma curves without increasing a size of a timing controller or a data driver.
- A more complete appreciation of the present inventive concept will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which:
-
FIG. 1 is a block diagram illustrating a display apparatus according to an exemplary embodiment of the present inventive concept; -
FIG. 2 is a graph illustrating gamma curves used in a display apparatus according to an exemplary embodiment of the present inventive concept; -
FIG. 3 is a diagram illustrating a display panel included in a display apparatus according to an exemplary embodiment of the present inventive concept; -
FIG. 4 is a block diagram illustrating a data driver included in a display apparatus according to an exemplary embodiment of the present inventive concept; and -
FIG. 5 is a table illustrating a look-up table stored in a data driver included in a display apparatus according to an exemplary embodiment of the present inventive concept. - Exemplary embodiments of the present inventive concept will be described in more detail below with reference to the accompanying drawings in which exemplary embodiments of the present inventive concept are shown.
-
FIG. 1 is a block diagram illustrating a display apparatus according to an exemplary embodiment of the present inventive concept. - Referring to
FIG. 1 , a display apparatus may include adisplay panel 100 and a panel driver. The panel driver may include atiming controller 200, agate driver 300, a gammareference voltage generator 400 and adata driver 500. - The
display panel 100 may include a display region displaying an image and a peripheral region adjacent to the display region. - The
display panel 100 may include a plurality of gate lines, a plurality of data lines and a plurality of pixels connected to the gate lines and the data lines. The gate lines may extend in a first direction D1 and the data lines may extend in a second direction D2 crossing the first direction D1. - In some exemplary embodiments of the present inventive concept, the pixels may include a switching element, a liquid crystal capacitor and a storage capacitor. The liquid crystal capacitor and the storage capacitor may be electrically connected to the switching element. The pixels may be arranged in a matrix configuration.
- The
display panel 100 will be described in more detail below with reference toFIG. 3 . - The
timing controller 200 may receive input image data RGB and an input control signal CONT from an external device. The input image data RGB may include red image data R, green image data G and blue image data B. The input control signal CONT may include a master clock signal and a data enable signal. The input control signal CONT may include a vertical synchronizing signal and a horizontal synchronizing signal. - The
timing controller 200 may generate a first control signal CONT1, a second control signal CONT2, a third control signal CONT3 and a data signal DAT based on the input image data RGB and the input control signal CONT. - The
timing controller 200 may generate the first control signal CONT1 controlling operations of thegate driver 300 based on the input control signal CONT, and may output the first control signal CONT1 to thegate driver 300. The first control signal CONT1 may include a vertical start signal and a gate clock signal. - The
timing controller 200 may generate the second control signal CONT2 controlling operations of thedata driver 500 based on the input control signal CONT, and may output the second control signal CONT2 to thedata driver 500. The second control signal CONT2 may include a horizontal start signal and a load signal. - The
timing controller 200 may generate the data signal DAT based on the input image data RGB and a first gamma curve. Thetiming controller 200 may output the data signal DAT to thedata driver 500. - The first gamma curve will be described in more detail below with reference to
FIG. 2 . - The
timing controller 200 may generate the third control signal CONT3 controlling operations of the gammareference voltage generator 400 based on the input control signal CONT, and may output the third control signal CONT3 to the gammareference voltage generator 400. - The
gate driver 300 may generate gate signals driving the gate lines in response to the first control signal CONT1 received from thetiming controller 200. Thegate driver 300 may sequentially output the gate signals to the gate lines. - In some exemplary embodiments of the present inventive concept, the
gate driver 300 may be directly disposed on thedisplay panel 100, or may be connected to thedisplay panel 100 in a tape carrier package (TCP) configuration. Alternatively, thegate driver 300 may be disposed on the peripheral region of thedisplay panel 100. - The gamma
reference voltage generator 400 may generate a gamma reference voltage VGREF in response to the third control signal CONT3 received from thetiming controller 200. The gammareference voltage generator 400 may output the gamma reference voltage VGREF to thedata driver 500. The level of the gamma reference voltage VGREF may correspond to grayscales of a plurality of pixel data included in the data signal DAT. - In some exemplary embodiments of the present inventive concept, the gamma
reference voltage generator 400 may be disposed in thetiming controller 200, or may be disposed in thedata driver 500. - The
data driver 500 may receive the second control signal CONT2 and the data signal DAT from thetiming controller 200, and may receive the gamma reference voltage VGREF from the gammareference voltage generator 400. Thedata driver 500 may convert the data signal DAT to data voltages having analogue levels based on the gamma reference voltage VGREF. Thedata driver 500 may output the data voltages to the data lines. - In some exemplary embodiments of the present inventive concept, the
data driver 500 may be directly disposed on thedisplay panel 100, or may be connected to thedisplay panel 100 in a tape carrier package (TCP) configuration. Alternatively, thedata driver 500 may be disposed on the peripheral region of thedisplay panel 100. - The
data driver 500 will be described in more detail below with reference toFIG. 4 . -
FIG. 2 is a graph illustrating gamma curves used in a display apparatus according to an exemplary embodiment of the present inventive concept. - Referring to
FIGS. 1 and 2 , gamma curves may indicate a relationship between a plurality of grayscales of an image and luminance or transmittance of thedisplay panel 100. A reference gamma curve GMR may increase a display quality of thedisplay panel 100. For example, the reference gamma curve GMR may be a gamma curve with a gamma value of about 2.2. - A luminance of an image based on a first gamma curve GM1 may be equal to or higher than a luminance of an image based on the reference gamma curve GMR. A luminance of an image based on a second gamma curve GM2 may be equal to or lower than the luminance of the image based on the reference gamma curve GMR. A composite gamma curve of the first gamma curve GM1 and the second gamma curve GM2 may be substantially the same as the reference gamma curve GMR.
- A pixel operating based on the reference gamma curve GMR may display an image having a luminance that is substantially the same as a target luminance. A pixel operating based on the first gamma curve GM1 may display an image having a luminance that is higher than the target luminance. A pixel operating based on the second gamma curve GM2 may display an image having a luminance that is lower than the target luminance. When one of two adjacent pixels operates based on the first gamma curve GM1, and when the other of two adjacent pixels operates based on the second gamma curve GM2, an image having the target luminance may be displayed by two adjacent pixels by combining the image having the lower luminance with the image having the higher luminance.
-
FIG. 3 is a diagram illustrating a display panel included in a display apparatus according to an exemplary embodiment of the present inventive concept. - Referring to
FIGS. 2 and 3 , thedisplay panel 100 may include first to third gate lines GL1, GL2, GL3 extending in the first direction D1, first to sixth data lines DL1, DL2, DL3, DL4, DL5, DL6 extending in the second direction D2 crossing the first direction D1 and first to third pixels P1, P2, P3. The first to third gate lines GL1˜GL3 may be sequentially arranged along the second direction D2. The first to sixth data lines DL1˜DL6 may be sequentially arranged along the first direction D1. - The first pixel P1 may include first and second sub-pixels SP1, SP2. The first sub-pixel SP1 may be connected to the first gate line GL1 and the first data line DLL The second sub-pixel SP2 may be connected to the first gate line GL1 and the second data line DL2. The first and second sub-pixels SP1, SP2 may be adjacent to each other along the second direction D2. Alternatively, the first and second sub-pixels SP1, SP2 may be adjacent to each other along the first direction D1.
- The first pixel P1 may display a first color. The first color may be one of red, green and blue. The first pixel P1 may display a first gray. The first sub-pixel SP1 may display the first gray based on the first gamma curve GM1. When the first sub-pixel SP1 displays the first gray based on the first gamma curve GM1, the second sub-pixel SP2 may display the first gray based on the second gamma curve GM2. Thus, the first pixel P1 may display the first gray based on the reference gamma curve GMR.
- The second pixel P2 may include third and fourth sub-pixels SP3, SP4. The third sub-pixel SP3 may be connected to the first gate line GL1 and the fourth data line DL4. The fourth sub-pixel SP4 may be connected to the first gate line GL1 and the third data line DL3. The third and fourth sub-pixels SP3, SP4 may be adjacent to each other along the second direction D2. Alternatively, the third and fourth sub-pixels SP3, SP4 may be adjacent to each other along the first direction D1.
- The second pixel P2 may display a second color. The second color may be one of red, green and blue. The second pixel P2 may display a second gray. The third sub-pixel SP3 may display the second gray based on the first gamma curve GM1. When the third sub-pixel SP3 displays the second gray based on the first gamma curve GM1, the fourth sub-pixel SP4 may display the second gray based on the second gamma curve GM2. Thus, the second pixel P2 may display the second gray based on the reference gamma curve GMR.
- The third pixel P3 may include fifth and sixth sub-pixels SP5, SP6. The fifth sub-pixel SP5 may be connected to the first gate line GL1 and the fifth data line DL5. The sixth sub-pixel SP6 may be connected to the first gate line GL1 and the sixth data line DL6. The fifth and sixth sub-pixels SP5, SP6 may be adjacent to each other along the second direction D2. Alternatively, the fifth and sixth sub-pixels SP5, SP6 may be adjacent to each other along the first direction D1.
- The third pixel P3 may display a third color. The third color may be one of red, green and blue. The third pixel P3 may display a third gray. The fifth sub-pixel SP5 may display the third gray based on the first gamma curve GM1. When the sub-pixel SP5 displays the third gray based on the first gamma curve GM1, the sixth sub-pixel SP6 may display the third gray based on the second gamma curve GM2. Thus, the third pixel P3 may display the third gray based on the reference gamma curve GMR.
-
FIG. 4 is a block diagram illustrating a data driver included in a display apparatus according to an exemplary embodiment of the present inventive concept.FIG. 5 is a table illustrating a look-up table stored in a data driver included in a display apparatus according to an exemplary embodiment of the present inventive concept. - Referring to
FIGS. 1, 2, 3, 4 and 5 , thedata driver 500 may include a firstdata voltage generator 510, adata converter 520 and a seconddata voltage generator 530. - The
data driver 500 may receive the data signal DAT from thetiming controller 200. The data signal DAT may include first pixel data PD1 and second pixel data PD2. The first pixel data PD1 and the second pixel data PD2 may be data instructing the first pixel P1 to display the first gray based on the first gamma curve GM1. The first pixel data PD1 may be substantially the same as the second pixel data PD2. - The first
data voltage generator 510 may receive the first pixel data PD 1. The firstdata voltage generator 510 may generate a first data voltage SDV1. The first data voltage SDV1 may have an analogue level based on the first pixel data PD1. The firstdata voltage generator 510 may output the first data voltage SDV1 to the first data line DL1. - The
data converter 520 may receive the second pixel data PD2. Thedata converter 520 may convert the second pixel data PD2 to first converted pixel data CPD1. The first converted pixel data CPD1 may be data instructing the first pixel P1 to display the first gray based on the second gamma curve GM2. Thedata converter 520 may output the first converted pixel data CPD1 to the seconddata voltage generator 530. - The
data converter 520 may store a look-up table. Thedata converter 520 may convert the second pixel data PD2 to the first converted pixel data CPD1 by referring to the look-up table. - For example, referring to
FIG. 5 , the second pixel data PD2 may have a value of 11111111 to display 255 gray based on the first gamma curve GM1. The first converted pixel data CPD1 may have a value of 11111110 to display 255 gray based on the second gamma curve GM2. Thedata converter 520 may convert the value of 11111111 to the value of 11111110 by referring to the look-up table. The second pixel data PD2 may have a value of 11111110 to display 254 gray based on the first gamma curve GM1. The first converted pixel data CPD1 may have a value of 11111100 to display 254 gray based on the second gamma curve GM2. Thedata converter 520 may convert the value of 11111110 to the value of 11111100 by referring to the look-up table. - The
data converter 520 according to an exemplary embodiment of the present inventive concept may include at least one nonvolatile memory such as an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory, a phase change random access memory (PRAM), a resistance random access memory (RRAM), a magnetic random access memory (MRAM), or a ferroelectric random access memory (FRAM). The look-up table may be stored in the nonvolatile memory. For example, the look-up table may be stored in the nonvolatile memory when manufacturing the display apparatus. - The
data converter 520 according to an exemplary embodiment of the present inventive concept may include at least one volatile memory such as a static random access memory (SRAM), or a dynamic random access memory (DRAM). The look-up table received from an external host or the timing controller, and may be stored in the volatile memory. For example, the look-up table may be stored in the volatile memory at the beginning of an operation of the display apparatus. - The second
data voltage generator 530 may generate a second data voltage SDV2. The second data voltage SDV2 may have an analogue level based on the first converted pixel data CPD1. The seconddata voltage generator 530 may output the second data voltage SDV2 to the second data line DL2. - A polarity of the first data voltage SDV1 may be different from a polarity of the second data voltage SDV2. For example, the polarity of the first data voltage SDV1 may be positive with respect to a common voltage, and the polarity of the second data voltage SDV2 may be negative with respect to the common voltage.
- The first data line DL1 may be adjacent to the second data line DL2. For example, referring to
FIG. 3 , the first pixel P1 may be connected to two adjacent data lines DL1, DL2, and two sub-pixels SP1, SP2 included in the first pixel P1 may be connected to two data lines DL1, DL2, respectively. - Referring to
FIGS. 3 and 4 , for example, data voltages SDV1, SDV2 may be output to two data lines DL1, DL2. However, according to exemplary embodiments of the present inventive concept, data voltages may be output to 2*n data lines, where n is a natural number equal to or greater than 2. For example, n data lines, such as odd-numbered data lines, may be connected to a data voltage generator, and the other n data lines, such as even-numbered data lines, may be connected to a data converter and a data voltage generator. The data converter may be shared by two data lines. - The data driver according to exemplary embodiments of the present inventive concept may include a display apparatus and/or a system including the display apparatus, such as a mobile phone, a smart phone, a PDA, a PMP, a digital camera, a digital television, a set-top box, a music player, a portable game console, a navigation device, a personal computer (PC), a server computer, a workstation, a tablet computer, a laptop computer, a smart card, or a printer.
- While the present inventive concept has been shown and described with reference to the exemplary embodiments thereof, it will be apparent to those of ordinary skill in the art that various changes in form and detail may be made thereto without departing from the spirit and scope of the present inventive concept.
Claims (20)
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KR1020150094216A KR20170005238A (en) | 2015-07-01 | 2015-07-01 | Data driver, display apparatus having the same and method of driving the display apparatus |
KR10-2015-0094216 | 2015-07-01 |
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